CN109236204B - Double-channel oil production pipe column - Google Patents
Double-channel oil production pipe column Download PDFInfo
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- CN109236204B CN109236204B CN201811184425.7A CN201811184425A CN109236204B CN 109236204 B CN109236204 B CN 109236204B CN 201811184425 A CN201811184425 A CN 201811184425A CN 109236204 B CN109236204 B CN 109236204B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 210000001503 joint Anatomy 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims 4
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
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Abstract
The invention relates to a dual-channel oil production pipe column which comprises an outer pipe, an upper sleeve arranged inside the upper end of the outer pipe, and a lower sleeve arranged inside the lower end of the outer pipe, wherein the lower part of the lower sleeve is in contact with oil liquid, the oil liquid enters a cavity at the lower part of the lower sleeve, and the upper sleeve discharges collected oil through an oil pump; the oil production pipe also comprises an oil production pipe which is arranged in the outer pipe and can rotate up and down along the outer pipe, wherein the oil production pipe is provided with a central hole with an opening at the upper end and a closed lower end, a floating ball is arranged on the central hole, and when the central hole is filled with oil, the floating ball is jacked up to discharge the oil. Particularly, the upper half ring of the first oil inlet is arranged to be inwards concave, the lower half ring of the first oil inlet is arranged to be outwards convex, and after oil enters the first oil inlet through the oil supply port, due to the fact that the speed is high, the buffering structure is arranged, the oil is slowed down to a certain degree, the oil is prevented from being disordered and whirled, and the oil collecting efficiency is improved.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a dual-channel oil extraction pipe column.
Background
In the existing oil exploitation process, mixed exploitation is avoided according to the distribution condition of each oil layer during exploitation, and in order to achieve the ideal exploitation effect, the common layered exploitation mode needs to promote the exploitation tubular column and change operation tools when the exploitation oil layer needs to be changed, so that the exploitation oil layer can be changed, the operation procedure is complicated, and the working efficiency is low.
However, in the prior art, when the upper and lower layers of mining are set, the intermediate structure is required to be capable of installing and setting the upper and lower layer mining switching structure, for example, switching is performed by means of an upper verification pin and the like, and a track is required to be set so as to enable the upper and lower layers of mining to be switched. In the process of deep mining, the structure is added, so that the stability of the structure of the pipeline is not facilitated, and the operation procedure is complicated.
Disclosure of Invention
Therefore, the invention provides a dual-channel oil production pipe column which is used for overcoming the problem of low oil production efficiency in the prior art.
In order to achieve the purpose, the invention provides a dual-channel oil production pipe column which comprises an outer pipe, an upper sleeve arranged inside the upper end of the outer pipe, and a lower sleeve arranged inside the lower end of the outer pipe, wherein the lower part of the lower sleeve is contacted with oil liquid, the oil liquid enters a cavity at the lower part of the lower sleeve, and the upper sleeve discharges the collected oil through an oil pump;
the oil production pipe also comprises an oil production pipe which is arranged in the outer pipe and can rotate up and down along the outer pipe, wherein the oil production pipe is provided with a central hole with an opening at the upper end and a closed lower end;
the upper end part of the oil production pipe is also provided with a first through oil inlet, the oil inlet end of the first oil inlet corresponds to an oil supply port on the outer wall of the outer pipe, the upper layer of oil is butted with the corresponding first oil inlet through the oil supply port, the oil enters the first oil inlet through the oil supply port and is discharged into the central hole of the oil production pipe from the first oil inlet, and after the oil is filled, the oil is discharged through an oil pump; the lower end part of the oil production pipe is provided with a second oil inlet, when the first oil inlet is in butt joint with the oil supply port, the second oil inlet is in butt joint with the inner side wall of the outer pipe, when the oil production pipe moves to the second oil inlet to be in contact with a second cavity at the lower end of the oil production pipe, the second oil inlet is communicated with lower-layer oil, the lower-layer oil is guided into the central hole through the second oil inlet, and after the oil production pipe is filled with the oil, the oil is discharged through an oil pump;
the first oil inlet end is provided with a buffer part, wherein the tangent curve of the upper half circle of the butted first oil inlet conforms to the following formula (1);
wherein l1The arc length of a tangent plane curve of the upper half circle of the first oil inlet is represented, D represents the length of the first oil inlet, the distance from the oil inlet end of the first oil inlet to the inner side wall of the oil production pipe, and D1Diameter of the first oil inlet, D2The diameter of the oil supply port is represented, and an included angle between a curve and a center line of the first oil inlet is represented by alpha and the value is 15-20 degrees;
the tangent curve of the lower half circle of the butted first oil inlet accords with the following formula (2);
in the formula I2The arc length of a tangent plane curve of the lower half circle of the first oil inlet is represented, D represents the length of the first oil inlet, and the arc length of the tangent plane curve of the lower half circle of the first oil inlet is represented from the first oil inletDistance from the oil inlet end to the inner side wall of the production pipe, D1Diameter of the first oil inlet, D2The diameter of the oil supply port is shown, and the alpha represents the included angle between the curve and the center line of the first oil inlet and takes the value of 15-20 degrees.
Furthermore, the side wall of the contact position of the oil production pipe and the outer pipe is provided with a plurality of groups of curve teeth, correspondingly, the inner side wall of the outer pipe is also provided with a plurality of groups of corresponding curve teeth, wherein one group of curve teeth comprises three sections,
the first curve segment is determined according to the following formula (3);
wherein L is1The arc length of the first curve section is shown, R represents the longest distance between the curve tooth and the inner side wall of the oil production pipe, R represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
Further, a second curve segment L2The endpoints a to b are determined according to the following formula (4);
wherein L1 represents the arc length of the first curved section, R represents the longest distance of the curved tooth from the inner side wall of the production tubing, R represents the shortest distance of the curved tooth from the inner side wall of the production tubing, and β represents the angle between the initial section of the first curved section and the horizontal line.
Further, a third curve segment L3The endpoints b to c are determined according to the following formula (5);
wherein L is1Indicates the arc length, L, of the first curve segment2Representing the arc length of the second curved section, R representing the tooth distance of the curve from the inner side wall of the production stringThe longest distance, r, represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
Furthermore, the upper end face of the oil production pipe is in contact with a shaft shoulder of the outer pipe so as to realize positioning and limiting, and a gasket is arranged on the outer side wall of the oil production pipe at the shaft shoulder.
Furthermore, the middle section of the oil production pipe is provided with a circle of groove, the inner side of the outer pipe at the corresponding position is also provided with a circle of groove, a third cavity enclosed by the two grooves is internally provided with a return spring, the upper end of the return spring is connected with the upper side wall of the groove of the oil production pipe, and the lower end of the return spring is connected with the bottom end of the groove at the inner side of the outer pipe.
Compared with the prior art, the dual-channel oil production pipe column has the advantages that the dual-channel oil production pipe column can be used for collecting oil on upper and lower layers respectively, and oil is input between different layers by arranging the oil inlets at different positions up and down on the oil production pipe which moves up and down.
Particularly, the upper half ring of the first oil inlet is arranged to be inwards concave, the lower half ring of the first oil inlet is arranged to be outwards convex, and after oil enters the first oil inlet through the oil supply port, due to the fact that the speed is high, the buffering structure is arranged, the oil is slowed down to a certain degree, the oil is prevented from being disordered and whirled, and the oil collecting efficiency is improved.
In the invention, the oil production pipe is meshed with the inner wall through the curve sections through the structure of the three curve sections and moves up and down, and the contact part of the first curve section and the second curve section is provided with the inflection point a.
Particularly, in the optimal embodiment of the invention, when the curve shape is determined, the included angle and the arc curve are introduced by combining the characteristics of the fluid, and the overall shapes of the oil inlet and the curve meshing section are determined by combining the curve length, the diameter of the oil supply port and the distance between the diameter of the oil inlet and the inner wall; when each curve section is arranged, flexible sine and cosine curves are adopted, so that dead angles and vortex generated by separation are avoided. Compared with the mode of positioning by adopting pins, the meshing structure is simple to operate and is not easy to generate interference.
Drawings
FIG. 1 is a schematic view of the overall structure of a dual-path production string according to the present invention;
FIG. 2 is a schematic partial view of FIG. 1 according to the present invention;
fig. 3 is a schematic structural diagram of the connecting side wall of the floating pipe column of the present invention.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, which is a schematic diagram of an overall structure of a dual-channel oil production string according to the present invention, the oil production string according to the present embodiment includes an outer tube 9, an upper casing 91 disposed inside an upper end of the outer tube 9, and a lower casing 92 disposed inside a lower end of the outer tube 9, wherein a lower portion of the lower casing 92 contacts oil, the oil enters a cavity at a lower portion of the lower casing 92, and the upper casing 91 discharges collected oil through an oil pump.
As shown in fig. 1, the oil production string of this embodiment further includes an oil production pipe 93 disposed in the outer pipe 9 and capable of rotating up and down along the outer pipe, wherein the oil production pipe 93 has a central hole with an open upper end and a closed lower end, a floating ball 90 is disposed on the central hole, when the central hole is filled with oil, the floating ball is lifted to discharge the oil, and when the central hole is not filled with oil, the floating ball closes the central hole. A certain gap is arranged between the outer side wall of the upper end of the oil production pipe 93 and the inner side wall of the outer pipe 9, so that the oil production pipe 93 can rotate up and down; at the same time, a cavity 951 is also provided between the production string 93 and the outer pipe 9 in the vertical direction to provide a production string movement space. In the embodiment of the present invention, the upper end surface of the oil production pipe 93 contacts with the shaft shoulder of the outer pipe 9 to achieve positioning and limiting, a gasket 952 is arranged on the outer side wall of the oil production pipe 93 at the shaft shoulder, and in order to prevent the relative movement between the gasket and the oil production pipe from being affected, the gasket 952 of the embodiment is fixed with the inner side wall of the oil production pipe 93.
Continuing to refer to fig. 1, the upper end portion of the oil production pipe 93 of the present embodiment is further provided with a first through oil inlet 931, an oil inlet end of the first oil inlet 931 corresponds to the oil supply port 953 on the outer wall of the outer pipe 9, in the present embodiment, the oil on the upper layer is butted with the corresponding first oil inlet through the oil supply port 953, the oil enters the first oil inlet 931 through the oil supply port 953 and is discharged into the central hole of the oil production pipe 93 from the first oil inlet 931, and after the oil is filled, the oil is discharged through the oil pump.
As shown in fig. 1, the lower end of the oil production pipe 93 of the present embodiment is provided with a second oil inlet 932, and when the first oil inlet is butted with the oil supply port 953, the second oil inlet 932 is butted with the inner side wall of the outer pipe 93, and cannot discharge oil in the lower layer; when the oil production pipe 93 rotates to the contact of the second oil inlet 932 and the second cavity 941 at the lower end of the oil production pipe 93, the second oil inlet 932 is communicated with lower-layer oil, the lower-layer oil is guided into the central hole through the second oil inlet 932, and after the oil is filled, the oil is discharged through an oil pump.
Continuing to refer to fig. 1, a circle of grooves is arranged at the middle section of the oil production pipe 93, a circle of grooves is also arranged at the inner side of the outer pipe at the corresponding position, a return spring 96 is arranged in a third cavity 954 enclosed by the two grooves, the upper end of the return spring is connected with the upper side wall of the groove of the oil production pipe 93, and the lower end of the return spring is connected with the bottom end of the groove at the inner side of the outer pipe. The return spring 96 is gradually compressed when the production pipe 93 rotates downward, and the return spring 96 is extended when the production pipe rotates upward, so that the second oil inlet 932 is quickly cut off from the lower-layer oil.
As shown in fig. 1 and fig. 2, the first oil inlet 931 of the present embodiment can only feed oil due to the butt joint with the oil feeding port of the outer tube, and the diameter of the oil is small when the oil passes through the oil feeding port, so that the oil flows into the oil feeding port in a turbulent and resistive manner, in the present embodiment, a buffer portion is disposed at the oil inlet end, wherein a tangent curve of the upper half circle of the butted first oil inlet conforms to the following formula (1);
wherein l1The arc length of a tangent plane curve of the upper half circle of the first oil inlet is represented, D represents the length of the first oil inlet, the distance from the oil inlet end of the first oil inlet to the inner side wall of the oil production pipe, and D1Diameter of the first oil inlet, D2The diameter of the oil supply port is shown, and the alpha represents the included angle between the curve and the center line of the first oil inlet and takes the value of 15-20 degrees.
The tangent curve of the lower half circle of the butted first oil inlet accords with the following formula (2);
in the formula I2The arc length of a tangent plane curve of the lower half circle of the first oil inlet is represented, D represents the length of the first oil inlet, and the arc length is from the oil inlet end of the first oil inlet to the inner side wall of the oil production pipeDistance of (D)1Diameter of the first oil inlet, D2The diameter of the oil supply port is shown, and the alpha represents the included angle between the curve and the center line of the first oil inlet and takes the value of 15-20 degrees.
Specifically, according to the embodiment of the invention, the upper half ring of the first oil inlet is arranged to be inwards concave, the lower half ring is arranged to be outwards convex, and after oil enters the first oil inlet through the oil supply port, due to the fact that the speed is high, the buffering structure is arranged, the oil is slowed down to a certain degree, the oil is prevented from being disordered and whirled, and the oil collection efficiency is improved.
Fig. 3 is a schematic structural view of a connecting side wall of the floating pipe column according to the present invention; when the oil production pipe is pressed downwards or pulled upwards, the oil production pipe is meshed with the inner side wall of the outer pipe through rotation and slides. The side wall of the contact position of the oil production pipe and the outer pipe is provided with a plurality of groups of curve teeth, correspondingly, the inner side wall of the outer pipe is also provided with a plurality of groups of corresponding curve teeth, wherein one group of curve teeth comprises three sections, as shown in figure 3,
the first curve segment is determined according to the following formula (3);
wherein L is1The arc length of the first curve section is shown, R represents the longest distance between the curve tooth and the inner side wall of the oil production pipe, R represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
Second curve segment L2The endpoints a to b are determined according to the following formula (4);
wherein L1 represents the arc length of the first curved section, R represents the longest distance of the curved tooth from the inner side wall of the production tubing, R represents the shortest distance of the curved tooth from the inner side wall of the production tubing, and β represents the angle between the initial section of the first curved section and the horizontal line.
Third curve segment L3The endpoints b to c are determined according to the following formula (5);
wherein L is1Indicates the arc length, L, of the first curve segment2The arc length of the second curve section is shown, R represents the longest distance between the curve tooth and the inner side wall of the oil production pipe, R represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
In the present embodiment, it is preferred that,
in the invention, the oil production pipe is meshed with the inner wall through the curve sections through the structure of the three curve sections and moves up and down, and the contact part of the first curve section and the second curve section is provided with the inflection point a.
Particularly, in the optimal embodiment of the invention, when the curve shape is determined, the included angle and the arc curve are introduced by combining the characteristics of the fluid, and the overall shapes of the oil inlet and the curve meshing section are determined by combining the curve length, the diameter of the oil supply port and the distance between the diameter of the oil inlet and the inner wall; when each curve section is arranged, flexible sine and cosine curves are adopted, so that dead angles and vortex generated by separation are avoided.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (6)
1. A dual-channel oil production pipe column is characterized by comprising an outer pipe, an upper sleeve arranged inside the upper end of the outer pipe, and a lower sleeve arranged inside the lower end of the outer pipe, wherein the lower part of the lower sleeve is in contact with oil liquid, the oil liquid enters a cavity at the lower part of the lower sleeve, and the upper sleeve discharges collected oil through an oil pump;
the oil production pipe also comprises an oil production pipe which is arranged in the outer pipe and can rotate up and down along the outer pipe, wherein the oil production pipe is provided with a central hole with an opening at the upper end and a closed lower end;
the upper end part of the oil production pipe is also provided with a first through oil inlet, the oil inlet end of the first oil inlet corresponds to an oil supply port on the outer wall of the outer pipe, the upper layer of oil is butted with the corresponding first oil inlet through the oil supply port, the oil enters the first oil inlet through the oil supply port and is discharged into the central hole of the oil production pipe from the first oil inlet, and after the oil is filled, the oil is discharged through an oil pump; the lower end part of the oil production pipe is provided with a second oil inlet, when the first oil inlet is in butt joint with the oil supply port, the second oil inlet is in butt joint with the inner side wall of the outer pipe, when the oil production pipe moves to the second oil inlet to be in contact with a second cavity at the lower end of the oil production pipe, the second oil inlet is communicated with lower-layer oil, the lower-layer oil is guided into the central hole through the second oil inlet, and after the oil production pipe is filled with the oil, the oil is discharged through an oil pump;
the first oil inlet end is provided with a buffer part, wherein the tangent curve of the upper half circle of the butted first oil inlet conforms to the following formula (1);
wherein l1Cutting of the upper half-ring to indicate the first oil inletThe arc length of the surface curve, D represents the length of the first oil inlet, the distance from the oil inlet end of the first oil inlet to the inner side wall of the oil production pipe, and D1Diameter of the first oil inlet, D2The diameter of the oil supply port is represented, and an included angle between a curve and a center line of the first oil inlet is represented by alpha and the value is 15-20 degrees;
the tangent curve of the lower half circle of the butted first oil inlet accords with the following formula (2);
in the formula I2The arc length of a tangent plane curve of the lower half circle of the first oil inlet is represented, D represents the length of the first oil inlet, the distance from the oil inlet end of the first oil inlet to the inner side wall of the oil production pipe, and D1Diameter of the first oil inlet, D2The diameter of the oil supply port is shown, and the alpha represents the included angle between the curve and the center line of the first oil inlet and takes the value of 15-20 degrees.
2. The dual path production string as claimed in claim 1, wherein the sidewall of the outer tube at the contact point of the production string and the outer tube is provided with a plurality of sets of curved teeth, and correspondingly, the inner sidewall of the outer tube is also provided with a plurality of corresponding sets of curved teeth, wherein one set of curved teeth comprises three sections,
the first curve segment is determined according to the following formula (3);
wherein L is1The arc length of the first curve section is shown, R represents the longest distance between the curve tooth and the inner side wall of the oil production pipe, R represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
3. The dual string as claimed in claim 2, wherein the second curve segment L is a curved segment2The endpoints a to b are determined according to the following formula (4);
wherein L1 represents the arc length of the first curved section, R represents the longest distance of the curved tooth from the inner side wall of the production tubing, R represents the shortest distance of the curved tooth from the inner side wall of the production tubing, and β represents the angle between the initial section of the first curved section and the horizontal line.
4. The dual string as claimed in claim 3, wherein the third curve segment L3The endpoints b to c are determined according to the following formula (5);
wherein L is1Indicates the arc length, L, of the first curve segment2The arc length of the second curve section is shown, R represents the longest distance between the curve tooth and the inner side wall of the oil production pipe, R represents the shortest distance between the curve tooth and the inner side wall of the oil production pipe, and beta represents the included angle between the initial section of the first curve section and the horizontal line.
5. The dual string as claimed in claim 2, wherein the upper end face of the production tubing is in contact with a shoulder of the outer tube where a washer is provided on the outer sidewall of the production tubing for positioning and spacing.
6. The dual-channel oil production string as claimed in claim 2, wherein a groove is formed in the middle section of the oil production pipe, a groove is formed in the inner side of the outer pipe at a corresponding position, a return spring is arranged in a third cavity defined by the two grooves, the upper end of the return spring is connected with the upper side wall of the groove of the oil production pipe, and the lower end of the return spring is connected with the bottom end of the groove in the inner side of the outer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184425.7A CN109236204B (en) | 2018-10-11 | 2018-10-11 | Double-channel oil production pipe column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184425.7A CN109236204B (en) | 2018-10-11 | 2018-10-11 | Double-channel oil production pipe column |
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| CN109236204B true CN109236204B (en) | 2020-11-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0505163D0 (en) * | 2005-03-14 | 2005-04-20 | Stewart Arthur | Downhole apparatus |
| CN201241817Y (en) * | 2008-08-15 | 2009-05-20 | 王敬东 | Double-channel fixing valve of tubular oil well pump |
| CN103089205B (en) * | 2013-01-23 | 2016-02-03 | 中庆能源工程技术有限公司 | Two-channel oil extraction switch |
| CN203050653U (en) * | 2013-01-23 | 2013-07-10 | 大庆纽斯达采油技术开发有限公司延安分公司 | Two-channel oil extraction pipe column |
| CN103104223B (en) * | 2013-02-05 | 2016-01-20 | 中庆能源工程技术有限公司 | Three-channel oil production switch |
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